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      1 /* Native-dependent code for AMD64 BSD's.
      2 
      3    Copyright (C) 2003-2024 Free Software Foundation, Inc.
      4 
      5    This file is part of GDB.
      6 
      7    This program is free software; you can redistribute it and/or modify
      8    it under the terms of the GNU General Public License as published by
      9    the Free Software Foundation; either version 3 of the License, or
     10    (at your option) any later version.
     11 
     12    This program is distributed in the hope that it will be useful,
     13    but WITHOUT ANY WARRANTY; without even the implied warranty of
     14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15    GNU General Public License for more details.
     16 
     17    You should have received a copy of the GNU General Public License
     18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     19 
     20 #include "inferior.h"
     21 #include "regcache.h"
     22 #include "target.h"
     23 
     24 /* We include <signal.h> to make sure `struct fxsave64' is defined on
     25    NetBSD, since NetBSD's <machine/reg.h> needs it.  */
     26 #include <signal.h>
     27 #include <sys/types.h>
     28 #include <sys/ptrace.h>
     29 #include <machine/reg.h>
     30 
     31 #include "amd64-tdep.h"
     32 #include "amd64-nat.h"
     33 #include "x86-bsd-nat.h"
     34 #include "inf-ptrace.h"
     35 #include "amd64-bsd-nat.h"
     36 
     37 
     39 static PTRACE_TYPE_RET
     40 gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr,
     41 	    PTRACE_TYPE_ARG4 data)
     42 {
     43 #ifdef __NetBSD__
     44   gdb_assert (data == 0);
     45   /* Support for NetBSD threads: unlike other ptrace implementations in this
     46      file, NetBSD requires that we pass both the pid and lwp.  */
     47   return ptrace (request, ptid.pid (), addr, ptid.lwp ());
     48 #else
     49   pid_t pid = get_ptrace_pid (ptid);
     50   return ptrace (request, pid, addr, data);
     51 #endif
     52 }
     53 
     54 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
     55    for all registers (including the floating-point registers).  */
     56 
     57 void
     58 amd64bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
     59 {
     60   struct gdbarch *gdbarch = regcache->arch ();
     61   ptid_t ptid = regcache->ptid ();
     62 
     63   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
     64     {
     65       struct reg regs;
     66 
     67       if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
     68 	perror_with_name (_("Couldn't get registers"));
     69 
     70       amd64_supply_native_gregset (regcache, &regs, -1);
     71       if (regnum != -1)
     72 	return;
     73     }
     74 
     75   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
     76     {
     77       struct fpreg fpregs;
     78 
     79       if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
     80 	perror_with_name (_("Couldn't get floating point status"));
     81 
     82       amd64_supply_fxsave (regcache, -1, &fpregs);
     83     }
     84 }
     85 
     86 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
     87    this for all registers (including the floating-point registers).  */
     88 
     89 void
     90 amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum)
     91 {
     92   struct gdbarch *gdbarch = regcache->arch ();
     93   ptid_t ptid = regcache->ptid ();
     94 
     95   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
     96     {
     97       struct reg regs;
     98 
     99       if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
    100 	perror_with_name (_("Couldn't get registers"));
    101 
    102       amd64_collect_native_gregset (regcache, &regs, regnum);
    103 
    104       if (gdb_ptrace (PT_SETREGS, ptid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
    105 	perror_with_name (_("Couldn't write registers"));
    106 
    107       if (regnum != -1)
    108 	return;
    109     }
    110 
    111   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
    112     {
    113       struct fpreg fpregs;
    114 
    115       if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
    116 	perror_with_name (_("Couldn't get floating point status"));
    117 
    118       amd64_collect_fxsave (regcache, regnum, &fpregs);
    119 
    120       if (gdb_ptrace (PT_SETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
    121 	perror_with_name (_("Couldn't write floating point status"));
    122     }
    123 }
    124